REJ03B0320-0010 Rev.0.10

Page 42 of 47

Jul 12, 2010

R8C/3JT Group

5. Electrical Characteristics

Specifications in this document are tentative and subject to change.

i = 0, 2

Figure 5.10

Serial Interface Timing Diagram when Vcc = 3 V

Notes:

1. When selecting the digital filter by the INTi input filter select bit, use an INTi input HIGH width of either (1/digital filter clock

frequency × 3) or the minimum value of standard, whichever is greater.

2. When selecting the digital filter by the INTi input filter select bit, use an INTi input LOW width of either (1/digital filter clock

frequency × 3) or the minimum value of standard, whichever is greater.

Figure 5.11

Input Timing for External Interrupt INTi and Key Input Interrupt KIi when Vcc = 3 V

Table 5.23

Serial Interface

Symbol

Parameter

Standard

Unit

Min.

Max.

CLKi input cycle time

300

—

ns

CLKi input “H” width

150

—

ns

CLKi Input “L” width

150

—

ns

TXDi output delay time

—

80

ns

TXDi hold time

0

—

ns

RXDi input setup time

70

—

ns

RXDi input hold time

90

—

ns

Table 5.24

External Interrupt INTi (i = 0 to 3) Input, Key Input Interrupt KIi (i = 0 to 3)

Symbol

Parameter

Standard

Unit

Min.

Max.

INTi input “H” width, KIi input “H” width

380 (1)

—ns

INTi input “L” width, KIi input “L” width

380 (2)

—ns

Vcc = 3 V

CLKi

TXDi

RXDi

i = 0, 2

INTi input

(i = 0 to 3)

KIi input

(i = 0 to 3)

Vcc = 3 V